CN101056130B - Method and system for processing signal in wireless receiver - Google Patents

Abstract

Methods and systems for diversity processing including using dedicated pilot method for closed loop may include combining a plurality of received WCDMA/HSDPA multipath signals for each diversity transmit antenna to at least one processed diversity signal. The received WCDMA/HSDPA multipath signals may originate from diversity transmit antennas at a base station that may be transmitting information via a closed loop or open loop diversity transmission mode. The closed loop diversity transmission mode may be closed loop 1 or closed loop 2. Estimations may be made of the closed loop transmit weights used by the base station for transmission of the symbols. Closed loop symbols transmitted by the diversity transmit antennas may then be estimated based on received diversity signals and at least one dedicated pilot channel. Open loop symbols may be estimated using information from at least one common pilot channel.

Description

Carry out the method and system of signal transacting at a wireless receiver

Technical field

The present invention relates to communication control processor, more particularly, relate to a kind of method and system utilizing special closed loop pilot method to carry out diversity process.

Background technology

Mobile communication has changed the communication way of people, and mobile phone also becomes a part indispensable people's daily life from luxury goods.Now, more social situations is decided by the use of mobile phone, and is not limited to geographical position or technology.When phonic communication meets the primary demand of communication, and when mobile voice contact penetrates into the every aspect of life, the next target that mobile Internet will become in mobile communication change.This mobile Internet will become a kind of public source of daily information naturally, and will become main flow in the nature of things to the more easy-to-use and more general mobile access way of these resources.

Third generation cellular network will be designed to meet the above-described tomorrow requirement to mobile Internet.When these services become increased popularity and universal, various factors, such as, to the cost benefit optimization problem of network capacity and service quality, the substantive issue that will cellular operator be become need solve compared with the past.These factors are by the better network planning and running, improve transmission method, and improve reception technique etc. and realize, finally, operators need a kind of technology, it can be allowed to increase downlink throughput capacity, and better service quality and speed can be provided simultaneously, thus contend with those technology transmitting data by cable modem and/or DSL service provider.In this, based on the network of Wideband CDMA technology, can be the data transmission of present cellular carrier to terminal use and make more practicable selection.

Introduced in 2003, there is UMTS technology up to 2Mbps gross data rate, by producing adopting the WCDMA 3G system of GSM technology to improve.One of them reason that UMTS technology can reach this High Data Rate is, compared with the GSM channel width of 200KHz, it has the WCDMA channel width of 5MHz.HSDPA technology is a kind of service based on Internet Protocol, is devoted to data communication, and it makes WCDMA support to be equivalent to the data transmission rate of the magnitude of 10Mbit/s.Along with the development of third generation partner program, this HSDPA technology reaches higher data transfer rate by multiple method.Such as, many transmission resolutions can be made in the base station level more close with subscriber equipment, but not mobile switching centre or central office.These resolutions comprise, and determine the scheduling to the data that will transmit, the time of data retransmission, and the assessment of quality to transmission channel.This HSDPA technology also can adopt variable encoding rate.This HSDPA technology also can support 16 grades of quadrature amplitude modulation to high speed descending sharing channel, allows multiple user to share an air interlace channel.

In some cases, HSDPA can carry out dual improvement in network capacity and data rate, thus provides even than the data rate of state-of-the-art 3G network also high five times (10Mbit/s).HSDPA also shortens the data transmission period of network and terminal, reduces the deviation existed in downstream propagation delay simultaneously.These improvement in performance directly can be converted to the lifting of network performance, and higher user satisfaction.Due to the expansion that HSDPA is WCDMA, its direct construction, on the basis of the most popular mobile technology in the world today, therefore has good economy.HSDPA provides breakthrough in the packet size of WCDMA network, strengthening frequency spectrum, the hardware efficiency of Radio Access Network and the streamlined of real-time performance etc.These improvement can be converted into lower cost, faster and more economical service, and one is dominated the network of more competitive superiority in market in the data in future.

HSDPA is that Virtual network operator creates considerable income in the advantage of capacity, quality and cost/aspect of performance, and and then has influence on its user.For operator, carrying out backward compatibility upgrading to existing WCDMA network, is reasonable during network is changed and the next step of economy.During configuration, HSDPA can coexist in same carrier wave with current WCDMA Release 99 service, thus allows operator to introduce larger capacity and the data rate of Geng Gao in existing WCDMA network.Operator can utilize this approach, supports the high data rate user of very most amount in an independent wireless carrier.HSDPA makes the Mobile IP multimedia of general marketplace become possibility, and by promoting the network service that need consume big data quantity, reduces the cost of transmission service simultaneously, thus adds tax revenue and network profit.For the mobile subscriber that demand data is eager, the performance advantage of HSDPA can change into the service response time of shorter time, and less delay be connected faster.User can while carrying out simultaneous voice call, by HSDPA downloading data bag.

HSDPA, compared with former technology or other substitute technologies, can provide many important improvement in performance.Such as, HSDPA utilizes high order modulation (16QAM), adaptive coding and modulation scheme, and the bit rate in WCDMA is risen to 10Mbps, reaches higher theoretical peak.For 16-QAM, its highest QPSK bit rate is 5.3Mbit/S and 10.7Mbit/S.When chnnel coding, the theoretical bit rate being up to 14.4M/S can be reached.When modulating with QPSK, termination capacity level is between 900Kbit/s and 1.8Mbit/s, can reach 3.6Mbit/s even higher with 16-QAM modulation.The support of peak capacity level is the bit rate of 14.4Mbit/s to the maximum.

But, implement advanced wireless technology, as WCDMA and/or HSDPA may still need to overcome some structural obstacles.Such as, RAKE (rake pin) receiver is the receiver the most often applying to cdma system, and main cause is its simply and reasonably performance, and can be applied in WCDMA Release 99 network.RAKE receiver comprises series of discrete serial correlation device, and each is for receiving independent multiple signals.RAKE receiver operates on multiple discreet paths.The multiple signals received merge by various ways, and tend to adopt maximum rate to merge (MRC) in the receiver be associated.But RAKE receiver may not be optimal in practice system, such as its performance reduces because of multi-access inference (MAI), and described multi-access inference refers to by the interference in network caused by other users.

In the down link of WCDMA, multi-access inference may to come between honeycomb and interference in honeycomb.Signal from neighbor base station causes inter-cell interference, shows as the base station signal that scrambler, channel and the angle of arrival are different from expection.Compartment equalization can be used for reducing the interference between honeycomb.In the application of simultaneous downlink, use orthogonal intersection, the circulation way of multipath may cause the interference in honeycomb.Owing to having the non-zero cross-correlation existed in the frequency expansion sequence of any time shift, can there is interference after despreading between route of transmission (or RAKE pointer), this interference will cause multi-access inference (MAI) and disturb (IPI) across footpath.Annoyance level in honeycomb depends primarily on channel response.In the channel of near flat decline, physical channel keeps almost orthogonal completely, and the interference in honeycomb can not produce significant impact to the performance of receiver.On the other hand, the performance of RAKE receiver can because disturbing and severe exacerbation in the honeycomb in frequency selective channel.Frequency selectivity is common for the channel in WCDMA network.

For opposing multi-access inference, can adopt linear disturbance Restrainable algorithms, this algorithm, based on linear channel equalization, is applicable to the system of the WCDMA/HSDPA adopting longer and orthogonal scrambler.Owing to having difficulties when non linear channel equalization being applied to WCDMA down link, with nonlinear equalizer to expecting that the detection of physical channel then can realize the multi-user reception of Interference Cancellation or the best.These two kinds of receivers are concerning very complicated mobile terminal, and its information needed can not obtain at mobile terminal place.Or all base station signals all can be considered expection signal.But non-linear equalizer depends on the priori of the cluster (planisphere, constellation) to expection signal, and these information still can not obtain in WCDMA terminal.The planisphere of total base station signal, the i.e. complete or collected works of all physical channels are high-order orthogonal amplitude modulation (QAM) planispheres with irregular spacing.Due to the transmitting power control (TPC) in control data field and possible power excursion, the spacing of planisphere is often changed, and time-division multiplex is in DPCH.The exponent number of planisphere can because of discontinuous transmission frequent variations.This makes to become very difficult to the accurate estimation of planisphere.

In this, systematic function can be made to be improved to the application of multiplexing and/or reception antenna.The configuration of this multiple antennas, is also called intelligent antenna technology, can be used for alleviating negative effect and the signal disturbing of multichannel in Signal reception.It is contemplated that intelligent antenna technology by the connection with the moving user unit in the facility of base station architecture and cellular system that is applied to of sustainable growth, thus will solve the demand of the increase capacity proposed in said system.The partly cause that these demands occur current voice-based service will be transformed into the wireless multimedia services of future generation providing voice, video, data communication.

To the application of multiplexing and/or reception antenna, be intended to introduce diversity gain and array gain, and the interference produced in Signal reception process is suppressed.This diversity gain, by increasing the signal to noise ratio of Received signal strength, provides the more high inhibition to signal disturbing, and/or allows to reuse more times of more high power capacity, and improves systematic function.Such as, in the communication system employing multi-aerial receiver, a set of M reception antenna can be used for the effect zero setting of individual to (M-1) interference.Therefore, N number of transmitting antenna can be utilized to be transmitted in same bandwidth by N number of signal simultaneously, then utilize configuration a set of N number of antenna on the receiver that the signal of transmission is divided into respective N number of signal.The system of many dual-mode antennas is utilized to can be described as multiple-input and multiple-output (MIMO) system.In multiaerial system, especially in mimo system, an aspect the most attractive is, adopts its transmission configuration significantly can increase power system capacity.When overall transmission power is fixing, the capacity that MIMO configures to be provided can increase in proportion with the increase of signal to noise ratio.

However, in radio communication, especially in wireless handset device to the widespread deployment of multiaerial system, limited due to the increase of specification, complexity and power consumption.For each dual-mode antenna provides the necessity of an independent radio frequency chain, it is the direct factor increasing multiaerial system cost.Each rf chain comprises low noise amplifier, filter, down converter and analog to digital converter (A/D) usually.Existingly have in the wireless receiver of single antenna at some, required rf chain can account for 30% of receiver total cost.Here it is along with the quantity of the equipment such as dual-mode antenna increases, the reason that system complexity, power consumption and total cost can increase.This just proposes problem in the design and application of mobile system.

Therefore, need to design the mobile system with less parts.Such as, the double antenna with Double RF path is better than with the single antenna of single radio-frequency path.But this may make signal transacting have a difficulty, because only have less independent variable for processing.

Other advantages of the present invention, object and novel features, and detailed graphic extension, will be explained more fully in ensuing description and diagram.

Summary of the invention

The invention provides a kind of method and system utilizing special closed loop pilot method to carry out diversity process, and explained more fully in specification and at least one accompanying drawing thereof

One aspect of the present invention, provide a kind of method of carrying out signal transacting at a wireless receiver, described method comprises:

Receive multiple WCDMA/HSDPA multiway transmission signal with closed loop diversity transmission mode, described WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

In merging described multiple WCDMA/HSDPA multiway transmission signals that each receives from described multiple diversity type transmitting antenna at least partially, to generate the diversity signal after at least one process;

Based on the projection of vector, from the diversity signal after at least one process described, estimation obtains the symbol sent, and wherein said projection is carried out according to the information from least one dedicated pilot (channel).

In said method, described closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 1 pattern.

Said method comprises further: by the dedicated pilot (channel) information relative to each in described multiple diversity type transmitting antennas of base station, in the diversity signal after projection at least one process described each, produce local channel estimated value.

Said method comprises further: based on described local channel estimated value, produces weights.

Said method comprises further: the weights utilizing described generation, estimation emission value.

Said method comprises further: the emission value obtained according to the described estimation of the diversity signal after at least one process described, estimates the symbol of described transmission.

Said method comprises further: according to the feedback weight of described base station, estimates the symbol of described transmission.

In said method, described closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 2 pattern.

Said method comprises further: by relative to each in the diversity signal after at least one process described in dedicated pilot (channel) information projection, produce local channel estimated value.

Said method comprises further: according to produced local channel estimated value, is the signal code that each estimation local in described multiple diversity type transmitting antennas of base station sends.

Said method comprises further: the channel symbol sent by the local will estimated for each in the multiple diversity type transmitting antenna of described base station is merged, and estimation obtains the symbol of described transmission.

Said method comprises further: carry out despreading to the part in the diversity signal after at least one process described.

Another aspect of the present invention, provide a kind of system of carrying out signal transacting at a wireless receiver, described system comprises:

For receiving the circuit of multiple WCDMA/HSDPA multiway transmission signal with closed loop diversity transmission mode, wherein said WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

For merging from described multiple diversity type transmitting antenna each in described multiple WCDMA/HSDPA multiway transmission signals of receiving at least partially to generate the signal processing circuit of the diversity signal after at least one process;

Obtain the diversity treatment circuit of the symbol sent for the estimation from the diversity signal after at least one process described of the projection based on vector, wherein said projection is carried out according to the information from least one dedicated pilot (channel).

In said system, described closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 1 pattern.

Said system comprises further: for passing through the dedicated pilot (channel) information relative to each in described multiple diversity type transmitting antennas of base station, and in the diversity signal after projection at least one process described, each produces the pilot channel treatment circuit of local channel estimated value.

In said system, described pilot channel treatment circuit produces weights according to described local channel estimated value.

Said system comprises further: the weights for the weights estimation emission value utilizing described generation produce circuit.

In said system, described diversity treatment circuit, according to the described emission value obtained for the diversity signal estimation after at least one process described, estimates the symbol of described transmission.

In said system, described diversity treatment circuit, according to the feedback weight of described base station, estimates the symbol of described transmission.

In said system, described closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 2 pattern.

Said system comprises further: for by relative to described in dedicated pilot (channel) information projection at least one process after diversity signal in each to produce the pilot channel treatment circuit of local channel estimated value.

In said system, described diversity type treatment circuit, according to produced local channel estimated value, is the channel symbol that each estimation local in described multiple diversity type transmitting antennas of base station sends.

In said system, the signal code that the local estimated for each in diversity type transmitting antenna multiple described in place, base station sends merges by described diversity type treatment circuit, estimates the symbol obtaining described transmission.

Said system comprises further: for carrying out the de-spreading circuit of despreading to the part in the diversity signal after at least one process described.

Another aspect of the present invention, provide a kind of method of carrying out signal transacting at a wireless receiver, described method comprises:

Receive multiple WCDMA/HSDPA multiway transmission signal with open loop diversity transmission mode, wherein said WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

Merge described multiple WCDMA/HSDPA multiway transmission signals of receiving from described multiple diversity type transmitting antenna each at least partially, to generate the diversity signal after at least one process;

According to the information from least one Common Pilot Channel, from the diversity signal after at least one process described, estimation obtains the symbol sent.

Said method comprises further: to described at least one process after diversity signal carry out despreading at least partially.

Another aspect of the present invention, additionally provide a kind of system of carrying out signal transacting at a wireless receiver, described system comprises:

For receiving the circuit of multiple WCDMA/HSDPA multiway transmission signal with open loop diversity transmission mode, wherein said WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

For to merge from described multiple diversity type transmitting antenna each described multiple WCDMA/HSDPA multiway transmission signals of receiving at least partially to generate the signal processing circuit of the diversity signal after at least one process;

For obtaining the diversity treatment circuit of the symbol sent according to the estimation from the diversity signal after at least one process described of the information from least one Common Pilot Channel.

Said system comprises further for the de-spreading circuit carrying out despreading at least partially to the diversity signal after at least one process described.

Other advantages of the present invention, object and novel features, and detailed graphic extension, will be explained more fully in ensuing description and diagram.

Accompanying drawing explanation

Fig. 1 a is the schematic diagram that can realize the adaptive HSDPA distributed structure/architecture of low latency link in one embodiment of the present of invention;

Fig. 1 b is arranged in base station, for removing the schematic diagram of the ground floor HARQ control of retransmitting relevant scheduling and storage from radio network controller in one embodiment of the present of invention;

Fig. 1 c is the schematic diagram of closed loop 1 feedback weight in one embodiment of the present of invention;

Fig. 1 d is the schematic diagram of closed loop 2 feedback phase in one embodiment of the present of invention;

Fig. 2 is the structure chart of receiver front end and chip matched filter in one embodiment of the present of invention;

Fig. 3 is the schematic diagram in one embodiment of the present of invention, the diversity coding transmission of WCDMA/HSDPA being carried out to symbol demodulation;

Fig. 4 is the method flow diagram taking space-time transmit diversity (STTD) pattern to carry out diversity process in one embodiment of the present of invention;

Fig. 5 a is the method flow diagram taking closed loop 1 dedicated pilot method to carry out diversity process in one embodiment of the present of invention;

Fig. 5 b is the method flow diagram taking closed loop 2 dedicated pilot method to carry out diversity process in one embodiment of the present of invention;

Fig. 6 takes closed loop 1 to carry out the method flow diagram of diversity process without pilot frequency system in one embodiment of the present of invention;

Fig. 7 takes closed loop 2 to carry out the method flow diagram of diversity process without pilot frequency system in one embodiment of the present of invention.

Embodiment

The invention provides and a kind ofly utilize special closed loop pilot method to carry out the method and system of diversity process, and be illustrated by way of example.Method aspect, comprises and merges multiple WCDMA/HSDPA multiway transmission signals that in multiple diversity type transmitting antenna, each receives, and to generate the diversity signal after at least one process, and it can be despread at least partially.The described WCDMA/HSDPA multiway transmission signal received derives from the diversity type transmitting antenna of base station, and described transmitting antenna launches information by closed loop or open loop diversity transmission mode.Sign estimation value is made up of the symbol sent by diversity type transmitting antenna.This estimation can comprise, and projects to the signal after process relative to the information from least one pilot channel.The object of described projection and the application is interrelated.

In one embodiment of the invention, closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 1 (CL 1) pattern.Such as, when base station is transmitted with closed loop 1 pattern, relative to the dedicated pilot (channel) information from each antenna in base station multiple diversity type transmitting antenna, the diversity signal after each process of this base station can be carried out project (or relevant), generates local channel estimated value.Then based on this local channel estimated value, weights can be produced.From these produced weights, emission value can be estimated.This estimation comprises, and maps to produced weights by one of mobile terminal multiple weights feeding back to base station.Then based on estimated emission value, can the symbol that diversity transmission antenna sends be estimated.

In another embodiment of the invention, this closed loop diversity transmission mode also comprises WCDMA closed loop 2 pattern.Such as, when base station is transmitted with closed loop 2 pattern, relative to dedicated pilot (channel) information, the diversity signal after process is projected (or relevant), local channel estimated value can be produced.Then, can based on the local channel estimated value generated, the signal code that the local estimating each diversity type transmitting antenna of base station sends.The channel symbol sent by base station being gone out local corresponding to each diversity type transmitting antenna merges, and can generate the estimated value of the symbol that base station sends.

In another embodiment of the invention, this diversity transmission mode comprises WCDMA/HSDPA open loop (or space-time transmit diversity) pattern.Such as, when base station is transmitted in this manner, the estimated value producing the symbol that base station sends at least partially of Common Pilot Channel information can be used.

The symbol that base station sends, also can estimate based on postbacking to the feedback weight of base station.Except above-mentioned closed loop 1 (CL 1) pattern and closed loop 2 (CL 2) pattern, this diversity transmission mode also comprises open loop (OL) pattern.This open loop mode is considered to again space-time transmit diversity (STTD) pattern.When taking closed loop 1 pattern, mobile terminal can feedback weight, for transmitting antenna independent in base station.When taking closed loop 2 pattern, mobile terminal can feed back two different weights, for the transmitting antenna of two in base station respectively.

All can use two kinds of methods in each embodiment of the present invention, thus relative to reception antenna, the signal that closed-loop fashion 1 and closed-loop fashion 2 optimization are launched can be adopted.First method is called without pilot frequency system (blindmethod).At this without in pilot frequency system, recipient's mobile terminal can produce a feedback weight, and sends it to transmitting base station, the signal that recipient's mobile terminal can use same feedback weight estimation to launch.But, in some cases, due to the such as reason such as up channel disturbance, in the feedback weight that transmitting base station receives, there is mistake.In the case, the weights that transmitting base station uses may be different from the weights that mobile terminal feeds back.Therefore, because transmitting base station is just using the weights different from recipient's mobile terminal, so this mobile terminal may not correctly recover sent information.

Second method is then transmitted and the weights used in Common Pilot Channel and dedicated pilot (channel) by transmitting base station by estimation, provides the recovery more accurately to the information sent.This second method is called dedicated pilot method.In the method, dedicated pilot (channel) estimated value can be used for generation and feeds back signal to transmitting base station.

Fig. 1 a is the schematic diagram of open loop WCDMA/HSDPA communication according to an embodiment of the invention.With reference to figure 1a, show mobile terminal 110 and 112 and base station 114.Base station 114 sends voice and/or data message to mobile terminal 110 and/or 112, and receives voice and/or data message from mobile terminal 110 and/or 112.Base station 114 is transmitted in an open-loop manner, can not obtain any weighted feedback from mobile terminal 110 and/or 112.Therefore, mobile terminal 110 and 112 can only according to the Common Pilot Channel that base station 114 sends, and the signal send base station 114 or symbol are estimated.

Fig. 1 b is the schematic diagram of closed loop WCDMA/HSDPA communication in one embodiment of the present of invention.With reference to figure 1b, show mobile terminal 120 and 122, and base station 124.Base station 124 sends voice and/or data message to mobile terminal 120 and/or 122, and receives voice and/or data message from mobile terminal 120 and/or 122.Base station 124 is transmitted in a closed loop manner, can obtain weighted feedback from mobile terminal 120 and/or 122.Therefore, mobile terminal 120 and 122 all can according to base station 124 send Common Pilot Channel and dedicated pilot (channel) and respectively by mobile terminal 120 and 122 generate weight information, to base station 124 send signal or symbol estimate.

First closed-loop policy can be described as closed loop 1 (CL 1) method.When taking closed loop 1 method to be, each mobile terminal can produce independent weights, and sends to base station.In closed loop 1 method, feedback weight can be the one in four different weights.Such as, these weights are +/-0.707 in X-axis, iY axle are +/-0.707, and wherein iY axle can be the Y-axis of plural number.Above-mentioned four kinds of issuable weights as illustrated in figure 1 c.

Second closed-loop policy can be described as closed loop 2 (CL 2) method.When taking closed loop 2 method, each mobile terminal can produce two weights, and sends to base station.In one embodiment of the invention, this feedback weight two signal s that base station 124 is sent ₁and s ₂there are two kinds of different power combination, and one (the signal s that such as base station 124 sends in two signals ₂) there are eight kinds of different phase place adjustment.Therefore, feedback weight can be the one in 16 different weights.These 16 issuable weights as illustrated in fig 1d.

Fig. 1 c shows in one embodiment of the present of invention the feedback weight adopting closed loop 1.With reference to figure 1c, show the chart 130 that four weights 132,134,136,138 of being produced by mobile terminal 120 and/or 122 are formed.Such as, from the weights of each mobile terminal 120 and 122, according to WCDMA/HSDPA standard feedback to base station 124.The phase place that first weights 132 are pointed out is π/4.The phase place that second weights 134 indicate is 3 π/4.The phase place that 3rd weights 136 indicate is 5 π/4.The phase place that 4th weights 138 indicate is 7 π/4.All above-mentioned four weights 132,134,136,138 can have unified performance number 1.The wherein one that the weights feeding back to base station 124 can be used in two signals sent base station 124 is modulated.Such as, the signal s sent by base station 124 ₂can be by the modulated signal of the weights from mobile terminal 120 and/or 122.

Fig. 1 d shows in one embodiment of the present of invention the feedback weight adopting closed loop 2.With reference to figure 1d, show the chart 140 that eight phase values 142,144,146,148,150,152,154,156 of being produced by mobile terminal 120 and/or 122 are formed.This phase value is a part for the weights that mobile terminal produces.The phase place that first weights 142 indicate is 0.The phase place that second weights 144 indicate is π/4.The phase place that 3rd weights 146 indicate is pi/2.The phase place that 4th weights 148 indicate is 3 π/4.The phase place that 5th weights 150 indicate is π.The phase place that 6th weights 150 indicate is 5 π/4.The phase place that 7th weights 152 indicate is 3 pi/2s.The phase place that 8th weights 154 indicate is 7 π/4.

Such as, mobile terminal also can be the wherein one that two signals that base station sends produce two kinds of power combination.According to one embodiment of present invention, a kind of power combination can indicate base station 124 to distribute power to the s that transmits with the ratio of 80% and 20% respectively ₁and s ₂.According to one embodiment of present invention, another kind of power combination can indicate base station 124 to distribute power to the s that transmits with the ratio of 20% and 80% respectively ₁and s ₂.These power combination may also be a part for the weights produced by mobile terminal.These weights can by mobile terminal according to WCDMA/HSDPA standard feedback to base station.Therefore, the weights feeding back to base station can be the wherein one of 16 different weights.

Base station 124 can use this phase value to launched by base station 124 two signals wherein one (such as, signal s ₂) phase place modulate.Base station 124 also can adopt this power ratio to modulate the power of two signals launched by base station 124.

Fig. 2 is the structure chart of receiver front end and chip matched filter in one embodiment of the present of invention.With reference to accompanying drawing 2, show transmitter components 200a, and receiver components 200b.This transmitter components 200a comprises modulation and coding module 202, and multiple transmitting antenna 204a and 204b.Data input x ₁, x ₂..., x _n, by as symbol, this modulation and coding module 202 can be inputted.Signal tx ₁and tx ₂can be radiofrequency signal, it by modulate and coding module 202 produces, and is sent separately transmitting antenna 204a and 204b.Receiver components 200b comprises reception antenna 210, RF front-end module 212, channel matched filter 214.

In transmitting terminal 200a, modulation and coding module 202 can be used for from data input x ₁and x ₂produce radiofrequency signal tx ₁and tx ₂, wherein data input x ₁and x ₂it is digit symbol.This radiofrequency signal tx ₁and tx ₂can be launched by transmitting antenna 204a and 204b respectively.This radiofrequency signal of launching, such as, radiofrequency signal s ₁and s ₂, can represent respectively by having time varying impulse response h ₁and h ₂channel transmitted.This radiofrequency signal s ₁and s ₂it can be identical or different signals.Such as, this radiofrequency signal s ₁and s ₂identical data can be comprised under closed loop 1 and closed loop 2 pattern, under Space Time Coding diversity mode, then comprise different data.

In receiving terminal 200b, reception antenna 210 comprises and the logic of its adaptation, circuit and/or coding, thus for received RF signal, such as, radiofrequency signal s ₁and s ₂.RF front-end module 212 comprises and the logic of its adaptation, circuit and/or coding, thus for receiving the radiofrequency signal of input, and these radiofrequency signals are converted to analog baseband signal.After generation analog baseband signal, this RF front-end module 212 carries out data sampling with set rate to this analog baseband signal, and the final digital baseband signal produced will become the output of RF front-end module 212.Channel matched filter 214 comprises and the logic of its adaptation, circuit and/or coding, thus for carrying out digital filtering to WCDMA/HSDPA baseband bandwidth, it can be a pair square root raised cosine type, be the necessary digital filter of WCDMA/HSDPA standard specification.

In operation, modulation and coding module 202 send radiofrequency signal by transmitting antenna 204a and 204b, and reception antenna 210 can received RF signal, and received radiofrequency signal are sent in RF front-end module 212.RF front-end module 212 is by carrying out filtering, amplification and/or lower conversion to received radiofrequency signal, and the radiofrequency signal this received is treated to baseband signal.This baseband signal can be carried out data sampling by analog to digital converter with certain sampling rate.This data sampling signal can be the output signal of RF front-end module 212, and this signal can be sent to channel matched filter 214, and carries out digital filtering wherein.Filtered signal can be exported by channel matched filter 214, and be sent to processor, such as, the cluster path processor (cluster path processor, is abbreviated as CPP) that can process the various multiway transmission signals of the radiofrequency signal of being launched by antenna such as transmitting antenna 204a or 204b.

Fig. 3 is the schematic diagram for the symbol demodulation in the diversity coding transmission of WCDMA/HSDPA.With reference to figure 3, show cluster path processing module 302, maximal ratio combiner (MRC) module 304, despreading module 306, diversity processing module 308, dedicated pilot (channel) processing module 310 and 312, and antenna verification (AV) module 314.For each base station, from transmitting antenna (transmitting antenna 204a and 204b such as Fig. 2) to the actual time varying impulse response of the channel of reception antenna (reception antenna 210 in such as Fig. 2), respectively with h ₁and h ₂represent.To the actual time varying impulse response h of channel ₁and h ₂estimated value, in each base station respectively with with represent.Information Availability from WCDMA/HSDPA Common Pilot Channel produces the time varying impulse response estimated with

Cluster path processing module 302 comprises multiple cluster path processor for receiving the output signal of channel matched filter 214 (shown in Fig. 2) and process.These clusters path processor 302a in cluster path processing module 302 ... 302n, can be divided into many groups, and wherein often group is used for following the trail of the temporal cluster of multiple signals, and estimates complex phase and the amplitude of multiple signals in this signal cluster.This signal cluster comprises maximum time difference and is no more than 16/ (3.84 × 10 ⁶) set of all signal paths received of second.On June 30th, 2005, the number of filing an application was No.11/173, and the U. S. application of 854, provides the description to signal cluster, and it is attached to herein present patent application in full by reference.

In one aspect of the invention, because WCDMA/HSDPA standard uses diversity transmission mode, two cluster path processor, all by two antenna transmission signals, have therefore been adopted just in each base station.This diversity transmission mode comprises closed loop 1 pattern (CL 1) and closed loop 2 (CL 2) pattern, and is also called open loop (OL) pattern of space-time emission diversity pattern.This cluster path processor 302 can be used for the channel estimation value and the channel time varying impulse response that determine each base station with lock indicator (lock indicator) ( , L ₁) and ( , L ₂), and recover the information by transmission in each base station.This lock indicator L ₁and L ₂be used to indicate, which part in corresponding estimated value has effective value.In one embodiment of the present of invention, use this lock indicator of strength assessment of the signal received.But when only having a transmitting antenna in each base station, then each base station is only assigned a cluster path processor.

This maximal ratio combiner module 304 comprises multiple maximal ratio combiner, i.e. 304a ... 304n.In each base station, the timing of cluster and the time varying impulse response estimated value of channel are provided to maximal ratio combiner module 304.Maximal ratio combiner module 304, for providing simple and effective Merge Scenarios or mechanism, resists noise, signal attenuation and channel disturbance in a way for using RAKE receiver.In one embodiment of the present of invention, each maximal ratio combiner 304a ... 304n includes and the logic of its adaptation, circuit and/or coding, thus utilizes maximum-ratio combing algorithm to merge multichannel coherent signal and incoherent noise.Each maximal ratio combiner 304a ... diversity signal after 304n at least one process exportable.Therefore, each maximal ratio combiner 304a ... 304n can be each base station export two process after diversity signal.Each maximal ratio combiner 304a ... 304n can take identical proportionality constant in the channel.The present invention also can take the merge algorithm of other the bests, such as, and least-mean-square error algorithm.The application number that on June 30th, 2005 proposes is No.11/173, and the U.S. Patent application of 870, provides the description to maximum-ratio combing module, and it is attached in present patent application in full by reference herein.

Despreading module 306 comprises multiple despreader, i.e. 306a ..., 306n.Each despreader 306a ..., 306n comprises and the logic of its adaptation, circuit and/or coding, thus for the signal received by despreading, this signal may utilize orthogonal intersection to carry out expansion before this in a transmitter of the invention.Before transmitting message signale and symbol, transmitter adopts orthogonal intersection, generates the signal comprising multiple chip (cihp).Despreading module 306 can be used for producing local code, and such as Gold code or Orthogonal Variable Spreading Factor OVSF code, it is applied to received signal by comprising the method such as multiplication and accumulating operation.Carry out after integration completes, just can realizing processing gain at the chip (the ovennodulation of the symbol in it) to predetermined quantity.

After the despreading of receiver place, initial symbol is extracted.WCDMA/HSDPA reduces multi-access inference by utilizing the spreading code in orthogonal spectrum expansion signal, transmits while can supporting the multiple spread-spectrum signals in single radio frequency signal.Receiver separates extended code by application, and from launched multiple spread-spectrum signals, extract each symbol, this solution extended code is identical with the code for generation of this spread-spectrum signal.With cluster path processing module 302 and maximal ratio combiner module 304 similar, despreading module 306 can be dispensed on each base station, and also can be allocated on same base station with the maximal ratio combiner module 304 that despreading module 306 carries out communicating.

Diversity processing module 308 comprises multiple diversity processor, i.e. 308a ..., 308n.In one embodiment of the invention, diversity processor 308a ..., 308n includes and the logic of its adaptation, circuit and/or coding, thus for merging the signal launched with diversity mode from multiple antennas.According to 3GPP technical specification 25.211 (the 6th edition), this diversity mode comprises open loop, closed loop 1 and closed loop 2.The operation conditions of technology of closed loop in change propagation environment is at a slow speed obviously better, this is because it more easily catches up with channel variation in this case.In one embodiment of the invention, diversity mode signals can need by the single hardware module of maximal ratio combiner module 304 input signal in process.

For dedicated pilot (channel) method, diversity processing module 308 receives dedicated pilot (channel) estimated value from dedicated pilot (channel) processing module 310 and 312.In addition, for closed loop 1 antenna verification method, in each base station, diversity processing module 308 receives single weights from antenna verification module 314; For closed loop 2 antenna verification method, in each base station, diversity processing module 308 receives two weights from antenna verification module 314.For the method without pilot tone, diversity processing module 308 receives the feedback channel weights T × W identical with sending to the weights of base station.On basis, each base station, produce the output valve of diversity processing module 308.

Dedicated pilot (channel) processing module 310 and 312 comprises multiple dedicated pilot (channel) processor, is 310a respectively ..., 310n, and 312a ..., 312n.In one embodiment of the invention, each dedicated pilot (channel) processor 310a, 310n and 312a, 312n includes and the logic of its adaptation, circuit and/or coding, thus by monitoring the dedicated pilot (channel) of respective antenna, detects and phase reference for each transmitting antenna provides relevant.Such as, dedicated pilot (channel) processor in dedicated pilot (channel) processing module 310 can be transmitting antenna 204a (Fig. 2 shown in) and provides relevant and detect and phase reference, and the dedicated pilot (channel) processor in dedicated pilot (channel) processing module 312 can be transmitting antenna 204b (shown in Fig. 2) and provides relevant and detect and phase reference.The output valve of dedicated pilot (channel) processing module 310 and 312 based on each base station, and can send into antenna verification module 314 and/or diversity processing module 308.

Power control bit and rate information is comprised in Dedicated Control Channel in WCDMA/HSDPA.Mobile radio station uses the synchronizing channel of WCDMA/HSDPA to obtain initial time synchronization.In WCDMA/HSDPA, use one or more paging channel to carry out paging to mobile terminal.In WCDMA/HSDPA, Common Pilot Channel provides reference signal and obtains (cell acquisition) for relevant detection, honeycomb and switch.When running of mobile terminal is in dedicated channel, it, except receiving this Common Pilot Channel, also receives dedicated pilot (channel).This dedicated pilot (channel) can be time-multiplexed channel, provides information for the diversity operation in WCDMA/HSDPA network.

Antenna verification module 314 comprise multiple antenna verification device (i.e. 314a ..., 314n), and feedback channel weights (T × W) generation module 314q.In one embodiment of the invention, each antenna verification device 314a, 314n includes and the logic of its adaptation, circuit and/or coding, thus for the treatment of the dedicated pilot (channel) information from dedicated pilot (channel) processing module 310 and 312, with the Common Pilot Channel estimated value from cluster path processing module 302, and export the estimation channel weights that can be used by diversity processing module 308 .Such as, when adopting without pilot frequency system, diversity processing module 308 can utilize the feedback channel weights T × W being sent to base station.T × W module 314q uses the channel estimation value of two transmitting antennas under closed loop 1 and closed loop 2 diversity mode with , calculate these feedback channel weights T × W.

This antenna verification device 314a ..., 314n can produce estimation channel weights , and send diversity processing module 308 to for carrying out antenna verification.For the antenna verification method of closed loop 1 pattern, estimation channel weights independent weights can be comprised.For the antenna verification method of closed loop 2 pattern, estimation channel weights two weights can be comprised.When mobile terminal moves with relatively high speed for base station, diversity mode closed loop l has preferably performance.Such as, when the Doppler frequency shift produced by mobile subscriber equipment is more than or equal to 60Hz, this diversity mode closed loop 1 has stronger application.When Doppler frequency shift is less than 60Hz, diversity mode closed loop 2 has stronger application.

In operation, the multipair cluster path processor in cluster path processing module 302 processes filtered baseband signal, to produce channel estimation with , and timing information T.This channel estimation with and timing information T produces based on each base station.Then, the channel estimation of every base station with and timing information T is admitted in maximal ratio combiner module 304, and channel estimation with can be admitted in antenna verification module 314 and process.The timing information T of every base station is also admitted in despreading module 306.Maximal ratio combiner module 304 can be used for the channel estimation utilizing every base station with and timing information T and filtered baseband signal, thus the signal sent for transmitting antenna each in base station produces the output signal of estimation.The output signal of this estimation can be sent in despreading module 306.

Despreading module 306 is used in despreading on basis, each base station and produces and exports estimated value.Despreading module 306 can utilize the input from maximal ratio combiner module 304 and cluster path processing module 302, produces this output estimated value.Output estimated value from despreading module 306 can be sent in diversity processing module 308 and dedicated pilot (channel) processing module 310 and 312.Diversity processing module 308 can be used for providing diversity process, and on basis, every base station output symbol estimated value.Diversity processing module 308 can utilize the input from despreading module 306, dedicated pilot (channel) processing module 310 and 312 and antenna verification module 314, produces output symbol estimated value.This output symbol estimated value can be sent in other processors, such as, in convolutional code decoder device or turbo decoder, thus is further processed to extract voice or data message respectively.

Dedicated pilot (channel) processing module 310 and 312 processes the estimation output valve from despreading module 306, to generate transmitting antenna (such as, antenna 204a and 204b shown in Fig. 2) specific information, and this information is sent in antenna verification module 314 and diversity processing module 308.The output information of dedicated pilot (channel) processing module 310and 312 generates on basis, each base station.When base station utilizes diversity mode CL 1 and CL 2 transmits, antenna verification module 314 processes associated antenna information, to produce estimation channel weights in addition, the Common Pilot Channel estimated value of two transmission diversity antennas can be utilized, calculate feedback channel weights T × W.Feedback channel weights T × W can send to base station, when adopting without pilot tone CL 1 and CL 2 method, also can send to diversity processing module 308.

Although have employed two cluster path processor according to the current each base station of WCDMA/HSDPA standard, the cluster path processor number quantitative limitation to being dispensed to base station should be regarded as yet.In other application of the present invention, according to the quantity of transmitting antenna in base station or other reasons, multiple cluster path processor can be distributed on demand in each base station.In addition, 16/ (3.84 × 10 ⁶) cluster cycle of second can be design separately and/or realize.Therefore, the present invention did not limit to due to this cluster cycle.

Fig. 4 is the method flow diagram taking space-time transmit diversity (STTD) pattern to carry out diversity process in one embodiment of the present of invention.This space-time diversity mode is open loop mode, therefore, there is not the feedback weight being sent to base station by mobile terminal.Space-time code algorithm can be modulated the signal comprising symbol sent by transmitting antenna, and wherein each transmitting antenna can send different data.Due to without the need to producing feedback weight, and decoding algorithm when only needing sky, therefore recipient's mobile terminal just can be simplified the process of received signal.

With reference to figure 4, step 400 to 408 for the treatment of diversity signal.In step 400, under open loop mode or space-time emission diversity pattern, can in two continuous time intervals, by reception antenna (such as reception antenna 210) Received signal strength r ₁and r ₂.This process represents by following equation, wherein supposes with single decay path to simplify the label in equation.

$\stackrel{\‾}{r}=\left[\begin{array}{c}{r}_1\\ r_2\end{array}\right]=\left[\begin{array}{cc}{s}_1& -s_2^{*}\\ s_2& s_1^{*}\end{array}\right]\left[\begin{array}{c}{h}_1\\ h_2\end{array}\right]---\left(1\right)$

Variable s ₁and s ₂represent the signal (symbol) sent by transmitting base station, h ₁and h ₂then represent actual propagation channel.

In step 402, cluster path processing module 302, according to the Common Pilot Channel sent by each base station (such as, base station 202), produces channel estimation value with variable with represent s respectively ₁and s ₂channel estimation value.Asterisk (*) after variable name is expressed as the complex conjugate of this variable.Such as, s ₂ ^*represent s ₂complex conjugate.

In step 404, maximal ratio combiner module 304 utilizes the channel estimation value from cluster path processing module 302 with process from the filtering of channel matched filter 214 and the baseband signal after digitized processing.Such as, the input of maximal ratio combiner module 304 can be the multiway transmission signal from two transmitting antennas in each base station.Each maximal ratio combiner in maximal ratio combiner module 304 can merge the multiway transmission signal from base station, to produce the diversity signal after at least one process.The signal received in maximal ratio combiner module 304 is multiplied by the complex conjugate of channel estimation value respectively with as follows:

${\hat{h}}_1^{*}{r}_1={\hat{h}}_1^{*}(h_1{s}_1-h_2{s}_2^{*})={\left|h_1\right|}^2{s}_1-{\hat{h}}_1^{*}{h}_2{s}_2^{*}---\left(2\right)$

${\hat{h}}_1^{*}{r}_2={\hat{h}}_1^{*}(h_1{s}_2-h_2{s}_1^{*})={\left|h_1\right|}^2{s}_2-{\hat{h}}_1^{*}{h}_2{s}_1^{*}---\left(3\right)$

${\hat{h}}_2^{*}{r}_1={\hat{h}}_2^{*}(h_1{s}_1-h_2{s}_2^{*})={-\left|h_2\right|}^2{s}_2^{*}-h_1{\hat{h}}_2^{*}{s}_1---\left(4\right)$

${\hat{h}}_2^{*}{r}_2={\hat{h}}_2^{*}(h_1{s}_2-h_2{s}_1^{*})={\left|h_2\right|}^2{s}_1^{*}-h_1{\hat{h}}_2^{*}{s}_2---\left(5\right)$

In a step 406, from the diversity signal after above-mentioned two process of maximal ratio combiner module 304 in each base station, despreading can be carried out by despreading module 306.The output signal of despreading module 306 can be sent to diversity processing module 308.In a step 408, diversity processing module 308 is by the estimated value of the signal of such as equation 2-5 acquisition transmitting as follows:

$\hat{s}=\left[\begin{array}{c}{\hat{s}}_1\\ {\hat{s}}_2\end{array}\right]=\left[\begin{array}{c}{\hat{h}}_1^{*}{r}_1+{\hat{h}}_2{r}_2^{*}\\ {\hat{h}}_1^{*}{r}_2-{\hat{h}}_2{r}_1^{*}\end{array}\right]---\left(6\right)$

Wherein with the signal s launched respectively ₁and s ₂estimated value.Can estimate that the Signal estimation value obtained is thus:

$\hat{s}=\left[\begin{array}{c}{\hat{s}}_1\\ {\hat{s}}_2\end{array}\right]=\left[\begin{array}{c}{\left|h_1\right|}^2{s}_1-{\hat{h}}_1^{*}{h}_2{s}_2^{*}+{\left|h_2\right|}^2{s}_1+h_1^{*}{\hat{h}}_2{s}_2^{*}\\ {\left|h_1\right|}^2{s}_2+{\hat{h}}_1^{*}{h}_2{s}_1^{*}+{\left|h_2\right|}^2{s}_2-h_1^{*}{\hat{h}}_2{s}_1^{*}\end{array}\right]=\left[\begin{array}{c}\left({\left|h_1^2\right|+\left|h_2\right|}^2\right)s_1\\ ({\left|h_1\right|}^2+{\left|h_2\right|}^2)s_2\end{array}\right]---\left(7\right)$

Fig. 5 a is the method flow diagram taking closed loop 1 dedicated pilot method to carry out diversity process in one embodiment of the present of invention.Closed loop 1 dedicated pilot method is that each transmitting antenna adopts special pilot channel, and the weights estimation value used by the one in two transmitting antennas.With reference to figure 5a, step 500 to 510 is for the treatment of diversity signal.Diversity signal can be the signal launched by least one antenna, such as, and the signal s launched by diversity antenna 204a and 204b ₁and s ₂.Diversity signal can relate to identical information, but for obtaining stronger Received signal strength, diversity signal can be launched in diversity configuration.Because diversity signal relates to identical information, for a part for the receiving system of receive diversity signal, such as, circuit shown in Fig. 3, can merge this diversity signal, to recover sent information.

In step 500, antenna 210 receives the signal s launched by diversity antenna 204a and 204b ₁and s ₂.The signal r that this receives can represent with following equation:

r＝(h ₁+wh ₂)s (8)

Wherein h ₁and h ₂for propagation channel, w is for being applied to the weights of the signal launched by antenna 204b, and s is the signal sent by transmitting antenna 204a and 204b.The signal r received can be processed by RF front-end module 212 and channel matched filter 214.Channel matched filter 214 can send through filtering and baseband signal after digitized processing to cluster path processing module 302 and maximal ratio combiner module 304.

In step 502, cluster path processing module 302, according to the Common Pilot Channel sent by each base station (such as, base station 202), produces channel estimation value with in step 504, maximal ratio combiner module 304 utilizes the channel estimation value from cluster path processing module 302 with process the baseband signal through filtering and after digitized processing from channel matched filter 214.Such as, the input of maximal ratio combiner module 304 can be the multiway transmission signal from two transmitting antennas in each base station.Each maximal ratio combiner in maximal ratio combiner module 304 can merge the multiway transmission signal from base station, to produce the diversity signal after at least one process.The signal received in maximal ratio combiner module 304 respectively with the complex conjugate of channel estimation value with be multiplied, as follows:

${\hat{h}}_1^{*}r={\hat{h}}_1^{*}(h_1+{\mathrm{wh}}_2)s=({\left|h_1\right|}^2+{w\hat{h}}_1^{*}{h}_2)s---\left(9\right)$

${\hat{h}}_2^{*}r={\hat{h}}_2^{*}(h_1+{\mathrm{wh}}_2)s=(w{\left|h_2\right|}^2+{h_1\hat{h}}_2^{*})s---\left(10\right)$

The dedicated pilot symbol x received ₁and x ₂mutually orthogonal, both can be replaced the Received signal strength s in above-mentioned equation 9 and 10.Such as, above-mentioned dedicated pilot symbol x ₁and x ₂sent by transmitting antenna 204a and 204b respectively.The Received signal strength of the output of maximum-ratio combing module 304 can be expressed as follows:

${\hat{h}}_1^{*}{r}_{\mathrm{dp}}={\hat{h}}_1^{*}(h_1{x}_1+{\mathrm{wh}}_2{x}_2)={\left|h_1\right|}^2{x}_1+{w\hat{h}}_1^{*}{h}_2{x}_2---\left(11\right)$

${\hat{h}}_2^{*}{r}_{\mathrm{dp}}={\hat{h}}_2^{*}(h_1{x}_1+{\mathrm{wh}}_2{x}_2)={w\left|h_2\right|}^2{x}_2+{h_1\hat{h}}_2^{*}{x}_1---\left(12\right)$

In step 506, from the diversity signal after above-mentioned two process of maximal ratio combiner module 304 in each base station, despreading can be carried out by despreading module 306.The output of despreading module 306 can be sent in diversity processing module 308 and dedicated pilot (channel) processing module 310 and 312.In step 508, dedicated pilot (channel) processing module 310 and 312, by applying orthogonal principle in equation 11 and 12, determines local channel estimated value.To variable x in equation 11 and 12 ₁and x ₂projection (or related operation) local channel estimated value can be drawn:

Utilize x ₁right carry out projecting (or related operation) can produce (| h ₁| ²) _dp, (13)

Utilize x ₂right carry out projecting (or related operation) can produce (14)

Utilize x ₁right carry out projecting (or related operation) can (w|h be produced ₂| ²) _dp, (15)

Utilize x ₂right carry out projecting (or related operation) can produce (16)

Then, weight w can be obtained from local channel estimated value.From four weights 132,134,136 and 138 select one with obtain weight w the most close to person, it can be used as the estimation emission value of closed loop 1 transmitting antenna weights w

In step 510, diversity processing module 308 can utilize the emission value estimated determine data symbol estim

$\hat{s}={\hat{h}}_1^{*}r+{\hat{w}}^{*}{\hat{h}}_2^{*}r={\hat{h}}_1^{*}(h_1+{\mathrm{wh}}_2)s+{\hat{w}}^{*}{{\hat{h}}_2}^{*}(h_1+{\mathrm{wh}}_2)s$

$=({\left|h_1\right|}^2+w{\hat{h}}_1^{*}{h}_2+{\hat{w}}^{*}{h}_1{\hat{h}}_2^{*}+{\left|w\right|}^2{\left|h_2\right|}^2)s---\left(17\right)$

$=({\left|h_1\right|}^2+2\mathrm{Re}\left(w{\hat{h}}_1^{*}{h}_2\right)+{\left|w\right|}^2{\left|h_2\right|}^2)s$

Emission value derotation is carried out when it should be pointed out that the result of equation 17 is equivalent to operative norm channel.

$\hat{s}={({\hat{h}}_1+\hat{w}{\hat{h}}_2)}^{*}(h_1+{\mathrm{wh}}_2)s$

$=({\left|h_1\right|}^2+w{\hat{h}}_1^{*}{h}_2+{\hat{w}}^{*}{h}_1{\hat{h}}_2^{*}+{\left|w\right|}^2{\left|h_2\right|}^2)s---\left(18\right)$

$=({\left|h_1\right|}^2+2\mathrm{Re}\left(w{\hat{h}}_1^{*}{h}_2\right)+{\left|w\right|}^2{\left|h_2\right|}^2)s$

Fig. 5 b is the method flow diagram taking closed loop 2 dedicated pilot method to carry out diversity process in one embodiment of the present of invention.The dedicated pilot (channel) that closed loop 2 dedicated pilot method utilizes two transmitting antennas to send.With reference to figure 5b, step 560 to 570 is for the treatment of diversity signal.Diversity signal can be the signal launched by least one antenna, such as, and the signal s launched by diversity antenna 204a and 204b ₁and s ₂.This diversity signal can relate to identical information, but for obtaining stronger Received signal strength, diversity signal can be launched in diversity configuration.Because diversity signal relates to identical information, for a part for the receiving system of receive diversity signal, such as circuit shown in Fig. 3, can merge this diversity signal, to recover sent information.

In step 560, antenna 210 can receive the signal s launched by diversity antenna 204a and 204b ₁and s ₂.This Received signal strength r can represent with following equation:

r＝(w ₁h ₁+w ₂h ₂)s (19)

Wherein h ₁and h ₂for actual propagation channel.Emission value w ₁and w ₂for being applied to the weights of the signal launched respectively by antenna 204a and 204b, and s is the signal sent by transmitting antenna 204a and 204b.This Received signal strength r can be processed by RF front-end module 212 and channel matched filter 214.Channel matched filter 214 can send through filtering and baseband signal after digitized processing to cluster path processing module 302 and maximal ratio combiner module 304.

In step 562, cluster path processing module 302, according to the Common Pilot Channel sent by each base station (such as, base station 202), produces channel estimation value with in step 564, maximal ratio combiner module 304 utilizes the channel estimation value from cluster path processing module 302 with process the baseband signal through filtering and after digitized processing from channel matched filter 214.Such as, the input of maximal ratio combiner module 304 can be the multiway transmission signal from two transmitting antennas in each base station.Each maximal ratio combiner in maximal ratio combiner module 304 can merge the multiway transmission signal from base station, to produce the diversity signal after at least one process.Received signal strength in maximal ratio combiner module 304 is multiplied by the complex conjugate of channel estimation value respectively with as follows:

${\hat{h}}_1^{*}r={\hat{h}}_1^{*}(w_1{h}_1+w_2{h}_2)s=(w_1{\left|h_1\right|}^2+w_2{\hat{h}}_1^{*}{h}_2)s---\left(20\right)$

${\hat{h}}_2^{*}r={\hat{h}}_2^{*}(w_1{h}_1+w_2{h}_2)s=(w_2{\left|h_2\right|}^2+w_1{h}_1{\hat{h}}_2^{*})s---\left(21\right)$

Received signal strength s in the replaceable above-mentioned equation 20 and 21 of the dedicated pilot symbol x received.Such as, transmitting antenna 204a and 204b sends identical symbol x by dedicated pilot (channel).The Received signal strength of the output of maximal ratio combiner module 304 can be expressed as follows:

${\hat{h}}_1^{*}{r}_{\mathrm{dp}}={\hat{h}}_1^{*}(w_1{h}_1+w_2{h}_2)x=(w_1{\left|h_1\right|}^2+w_2{\hat{h}}_1^{*}{h}_2)x---\left(22\right)$

${\hat{h}}_2^{*}{r}_{\mathrm{dp}}={\hat{h}}_2^{*}(w_1{h}_1+w_2{h}_2)x=(w_2{\left|h_2\right|}^2+w_1{h}_1{\hat{h}}_2^{*})x---\left(23\right)$

In step 566, from the diversity signal after two process of maximal ratio combiner module 304 in each base station, despreading can be carried out by despreading module 306.The output of despreading module 366 can be sent in diversity processing module 308 and dedicated pilot (channel) processing module 310 and 312.In step 568, dedicated pilot (channel) processing module 310 and 312, by projecting (or related operation) to variable x in equation 22 and 23, determines the local channel estimated value of the dedicated pilot signal sent by two transmitting antennas with

${\hat{h}}_{\mathrm{dp}1}={(w_1{\left|h_1\right|}^2+w_2{\hat{h}}_1^{*}{h}_2)}_{\mathrm{dp}}---\left(24\right)$

${\hat{h}}_{\mathrm{dp}2}={(w_2{\left|h_2\right|}^2+w_1{h}_1{\hat{h}}_2^{*})}_{\mathrm{dp}}---\left(25\right)$

In step 570, diversity processing module 308 can by the local channel estimated value in equation 22 and 23 respectively with with be multiplied, thus obtain local symbol estimated value respectively with

${\hat{s}}_1={\hat{h}}_{\mathrm{sp}1}^{*}{\hat{h}}_1^{*}r={{(w_1{\left|h_1\right|}^2+w_2{\hat{h}}_1^{*}{h}_2)}^{*}}_{\mathrm{dp}}(w_1{\left|h_1\right|}^2+w_2{\hat{h}}_1^{*}{h}_2)s$

$=({\left|w_1\right|}^2{\left|h_1\right|}^4+{\left|w_2\right|}^2{\left|h_1\right|}^2{\left|h_2\right|}^2+2\mathrm{Re}\left(w_2{\hat{h}}_1^{*}{h}_2\right))s---\left(26\right)$

${\hat{s}}_2={\hat{h}}_{\mathrm{sp}2}^{*}{\hat{h}}_2^{*}r={{(w_2{\left|h_2\right|}^2+w_1{h}_1{\hat{h}}_2^{*})}^{*}}_{\mathrm{dp}}(w_2{\left|h_2\right|}^2+w_1{h}_1{\hat{h}}_2^{*})s$

$=({\left|w_2\right|}^2{\left|h_2\right|}^4+{\left|w_1\right|}^2{\left|h_1\right|}^2{\left|h_2\right|}^2+2\mathrm{Re}\left(w_1{\hat{h}}_1^{*}{h}_2\right))s---\left(27\right)$

By by local symbol estimated value with be added, sign estimation value can be generated

$\hat{s}={\hat{s}}_1+{\hat{s}}_2$

$=({\left|w_1\right|}^2{\left|h_1\right|}^4+{\left|w_2\right|}^2{\left|h_1\right|}^2{\left|h_2\right|}^2+2\mathrm{Re}\left(w_2{\hat{h}}_1^{*}{h}_2\right)+{\left|w_2\right|}^2{\left|h_2\right|}^4+{\left|w_1\right|}^2{\left|h_1\right|}^2{\left|h_2\right|}^2+2\mathrm{Re}\left(w_1{\hat{h}}_1^{*}{h}_2\right))s---\left(28\right)$

Fig. 6 takes closed loop 1 to carry out the method flow diagram of diversity process without the method for pilot tone in one embodiment of the present of invention.This closed loop 1 uses the feedback weight being sent to base station to generate the symbol sent by base station without pilot frequency system and obtains estimated value, instead of adopts the estimated value of the emission value used by the wherein one in two transmitting antennas.Therefore, this closed loop 1 can not compensate difference between emission value that the weights that sent by mobile terminal and reality uses by base station without pilot frequency system.With reference to figure 6, step 600 to 640 for the treatment of diversity signal.Step 600,610,620 and 630 respectively with abovementioned steps 500,502,504 and 506 similar.

In step 640, diversity processing module 308 is sent to the weight w of base station by using, generate sign estimation value

$\hat{s}={\hat{h}}_1^{*}r+{\hat{w}}^{*}{\hat{h}}_2^{*}r={\hat{h}}_1^{*}(h_1+{\mathrm{wh}}_2)s+{\hat{w}}^{*}{{\hat{h}}_2}^{*}(h_1+{\mathrm{wh}}_2)s$

$=({\left|h_1\right|}^2+w{\hat{h}}_1^{*}{h}_2+{\hat{w}}^{*}{h}_1{\hat{h}}_2^{*}+{\left|w\right|}^2{\left|h_2\right|}^2)s---\left(29\right)$

$=({\left|h_1\right|}^2+2\mathrm{Re}\left(w{\hat{h}}_1^{*}{h}_2\right)+{\left|w\right|}^2{\left|h_2\right|}^2)s$

Emission value derotation is carried out when it should be pointed out that the result of equation 29 is equivalent to operative norm channel.

$\hat{s}={({\hat{h}}_1+\hat{w}{\hat{h}}_2)}^{*}(h_1+{\mathrm{wh}}_2)s$

$=({\left|h_1\right|}^2+w{\hat{h}}_1^{*}{h}_2+w^{*}{h}_1{\hat{h}}_2^{*}+{\left|w\right|}^2{\left|h_2\right|}^2)s---\left(30\right)$

$=({\left|h_1\right|}^2+2\mathrm{Re}\left(w{\hat{h}}_1^{*}{h}_2\right)+{\left|w\right|}^2{\left|h_2\right|}^2)s$

Fig. 7 takes closed loop 2 to carry out the method flow diagram of diversity process without pilot frequency system in one embodiment of the present of invention.This closed loop 2 uses the feedback weight being sent to base station to generate the estimated value of the symbol sent by base station without pilot frequency system, instead of the estimated value of the emission value adopting in base station two transmitting antennas to use.Therefore, this closed loop 1 can not compensate without pilot frequency system the weights that sent by mobile terminal and by the difference between the emission value of the actual use in base station.With reference to figure 7, step 700 to 740 for the treatment of diversity signal.Step 700,710,720 and 730 respectively with abovementioned steps 560,562,564 and 566 similar.

In step 740, diversity processing module 308 is logical uses the weight w sending to base station ₁and w ₂, generate sign estimation value

$\hat{s}=w_1^{*}{\hat{h}}_1^{*}r+w_2^{*}{\hat{h}}_2^{*}r$

$=({\left|w_1\right|}^2{\left|h_1\right|}^2+2\mathrm{Re}\left(w_1^{*}{w}_2{\hat{h}}_1^{*}{h}_2\right)+{\left|w_2\right|}^2{\left|h_2\right|}^2)s---\left(31\right)$

In equation 17,26,27,28,29 and 31, the expression formula after second equal sign is all expansions mathematically.Only just can realize with regard to this purpose, the expression formula before second equal sign just enough implements.

In one embodiment of the invention, example system includes circuit, such as antenna 210, and this circuit can receive the WCDMA/HSDPA multiway transmission signal sent by each diversity type transmitting antenna 204a and 204b in base station.Signal processing circuit, such as maximal ratio combiner module 304, WCDMA/HSDPA multiway transmission signal can be merged at least one process after diversity signal, and this diversity signal at least partially can despreading.The WCDMA/HSDPA multiway transmission signal received may be derived from diversity type transmitting antenna 204a and 204b, and wherein base station 202 can the diversity transmission pattern of closed loop or open loop be launched.The estimated value of the closed loop symbol that diversity type transmitting antenna 204a and 204b sends, is determined by the information based at least one dedicated pilot (channel) sent from transmitting antenna 204a and 204b.The estimated value of the closed loop symbols transmitted that diversity type transmitting antenna 204a and 204b sends, can determine based on the information of at least one Common Pilot Channel sent from transmitting antenna 204a and 204b.

Closed loop diversity emission mode comprises WCDMA/HSDPA closed loop 1 pattern.Such as, when base station 202 is transmitted with closed loop 1 pattern, pilot channel treatment circuit, such as dedicated pilot (channel) processing module 310 and 312 can generate local channel estimated value.Relative to the dedicated pilot (channel) information from each in diversity type transmitting antenna 204a and 204b of base station 202, the diversity signal after each process of dedicated pilot (channel) processing module 310 and 312 pairs of base stations projects (or relevant).Dedicated pilot (channel) processing module 310 and 312 can produce weights based on this local channel estimated value.Antenna verification module 314 is again according to produced weights estimation emission value.This estimation can comprise, and produced weights are mapped to one of multiple weights.The estimation of the symbol that diversity type transmitting antenna 204a and 206b sends draws based on estimated emission value by diversity treatment circuit (such as, diversity processing module 308).

Closed loop diversity emission mode comprises WCDMA/HSDPA closed loop 2 pattern.When base station 202 is with closed loop 2 mode transfer data, dedicated pilot (channel) processing module 310 and 312 is passed through relative to dedicated pilot (channel) information, diversity signal after each process is projected (or related operation), produces local channel estimated value.Diversity processing module 308 is estimated local emission channel symbol according to the local channel estimated value generated.Then, diversity processing module 308, by merging the local emission channel symbol estimated, draws the estimated value of the transmitting symbol from base station 202.Diversity processing module 308 also according to loopback to the feedback weight of base station 202, can draw the estimated value of the transmitting symbol from base station 202.

The present invention can pass through hardware, software, or soft and hardware combination realizes.The present invention can realize in a centralised manner at least one computer system, or is realized with a scattered manner by the different piece be distributed in the computer system of several interconnection.Any can computer system to implement the methods or miscellaneous equipment be all applicatory.The combination of conventional software and hardware can be the general-purpose computing system being provided with computer program, by installing and perform described program-con-trolled computer system, makes it run by described method.In computer systems, which, utilize processor and memory cell to realize described method.

The present invention can also be implemented by computer program, and described program package contains whole features that can realize the inventive method, when it is installed in computer system, by running, and can be to perform the methods of the present invention.Computer program in presents referred to: any expression formula of one group of instruction that any program language, code or symbol can be adopted to write, this instruction group makes system have information processing capability, directly to realize specific function, or realize specific function after carrying out one or two step following: a) convert other Languages, coding or symbol to; B) reproduce in a different format.

The present invention is described by several specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to substituting to the present invention.In addition, for particular condition or concrete condition, various amendment can be made to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes fallen within the scope of the claims in the present invention.

Claims (4)

1. carry out a method for signal transacting at a wireless receiver, it is characterized in that, described method comprises:

Receive multiple WCDMA/HSDPA multiway transmission signal with closed loop diversity transmission mode, to produce channel estimating, described WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

In merging described multiple WCDMA/HSDPA multiway transmission signals that each receives from described multiple diversity type transmitting antenna at least partially, with generate at least one merge after diversity signal, described in merge into the complex conjugate received signal transmission being at least partially multiplied by respectively channel estimation value;

By projecting to the diversity signal after process relative to dedicated pilot (channel) information, produce local channel estimated value; According to produced local channel estimated value, the signal code that the local estimating each diversity type transmitting antenna of base station sends; Merged by the channel symbol that local corresponding for each for base station diversity type transmitting antenna is sent, generate the estimated value of the symbol that base station sends;

Described closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 2 pattern.

2. carry out a system for signal transacting at a wireless receiver, it is characterized in that, described system comprises:

For receiving multiple WCDMA/HSDPA multiway transmission signal with closed loop diversity transmission mode and producing the circuit of channel estimating, wherein said WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

For to merge from described multiple diversity type transmitting antenna each in described multiple WCDMA/HSDPA multiway transmission signals of receiving at least partially with generate at least one merge after the signal processing circuit of diversity signal, described in merge into the complex conjugate received signal transmission being at least partially multiplied by respectively channel estimation value;

For by projecting to the diversity signal after process relative to dedicated pilot (channel) information, produce the dedicated pilot (channel) processing module of local channel estimated value;

For according to produced local channel estimated value, the signal code that the local estimating each diversity type transmitting antenna of base station sends, and merged by the channel symbol that local corresponding for each for base station diversity type transmitting antenna is sent, to generate the diversity processing module of the estimated value of the symbol that base station sends;

Described closed loop diversity transmission mode comprises WCDMA/HSDPA closed loop 2 pattern.

3. carry out a method for signal transacting at a wireless receiver, it is characterized in that, described method comprises:

Receive multiple WCDMA/HSDPA multiway transmission signal with open loop diversity transmission mode, to produce channel estimating, wherein said WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

Merging described multiple WCDMA/HSDPA multiway transmission signals that each receives from described multiple diversity type transmitting antenna at least partially, with generate at least one merge after diversity signal, described in merge into the complex conjugate received signal transmission being at least partially multiplied by respectively channel estimation value;

From described at least one process after diversity signal estimation obtain send symbol, and to described at least one process after diversity signal carry out despreading at least partially.

4. carry out a system for signal transacting at a wireless receiver, it is characterized in that, described system comprises:

For receiving multiple WCDMA/HSDPA multiway transmission signal with open loop diversity transmission mode and producing the circuit of channel estimating, wherein said WCDMA/HSDPA multiway transmission signal receives from multiple diversity type transmitting antennas of base station;

For to merge from described multiple diversity type transmitting antenna each described multiple WCDMA/HSDPA multiway transmission signals of receiving at least partially with generate at least one merge after the signal processing circuit of diversity signal, described in merge into the complex conjugate at least one received signal transmission being multiplied by respectively channel estimation value;

For obtaining the diversity treatment circuit of the symbol sent according to the estimation from the diversity signal after at least one process described of the information from least one Common Pilot Channel;

For the de-spreading circuit carrying out despreading at least partially to the diversity signal after at least one process described.